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  • Why is the volatile qualifier used through out std::atomic?

    - by Caspin
    From what I've read from Herb Sutter and others you would think that volatile and concurrent programming were completely orthogonal concepts, at least as far as C/C++ are concerned. However, in GCC c++0x extension all of std::atomic's member functions have the volatile qualifier. The same is true in Anthony Williams's implementation of std::atomic. So what's deal, do my atomic<> variables need be volatile or not?

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  • Capture *all* display-characters in JavaScript?

    - by Jean-Charles
    I was given an unusual request recently that I'm having the most difficult time addressing that involves capturing all display-characters when typed into a text box. The set up is as follows: I have a text box that has a maxlength of 10 characters. When the user attempts to type more than 10 characters, I need to notify the user that they're typing beyond the character count limit. The simplest solution would be to specify a maxlength of 11, test the length on every keyup, and truncate back down to 10 characters but this solution seems a bit kludgy. What I'd prefer to do is capture the character before keyup and, depending on whether or not it is a display-character, present the notification to the user and prevent the default action. A white-list would be challenging since we handle a lot of international data. I've played around with every combination of keydown, keypress, and keyup, reading event.keyCode, event.charCode, and event.which, but I can't find a single combination that works across all browsers. The best I could manage is the following that works properly in =IE6, Chrome5, FF3.6, but fails in Opera: NOTE: The following code utilizes jQuery. $(function(){ $('#textbox').keypress(function(e){ var $this = $(this); var key = ('undefined'==typeof e.which?e.keyCode:e.which); if ($this.val().length==($this.attr('maxlength')||10)) { switch(key){ case 13: //return case 9: //tab case 27: //escape case 8: //backspace case 0: //other non-alphanumeric break; default: alert('no - '+e.charCode+' - '+e.which+' - '+e.keyCode); return false; }; } }); }); I'll grant that what I'm doing is likely over-engineering the solution but now that I'm invested in it, I'd like to know of a solution. Thanks for your help!

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  • How do you keep track of your thought process ?

    - by Johnny Blaze
    I find it very hard to answer question like : "why did you implemented it this way?" or "what's the reason of using that instead of that?" usually because the implementation is the result of a long thought process and trials and errors. By the time i'm finished i can't recall every specific details. I wanted to know if you have some tips to keep track of your thought process and answer those question easily.

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  • .NET: Allow NULLS in DB fields?

    - by mark smith
    Hi there, I have the task of re-factoring an SQLServer DB.... A lot of the tables and columns "ALLOW NULLS", Is this good practice... I seem to remember the authour of CSLA.NET saying it was really bad practice to allow nulls in a DB... If this is the case, what are my alternatives? Remove all "ALLOW NULLS" from all columns.... and in numeric columns use a value of -1 for example?? I would really appreciate any input anyone has. I am currently using a Model (from entity framework) from my DB and the db columns that "ALLOW NULLS" are null ... and some of the stored procedures require that i have a default value... i.e. BOOLEAN require FALSE as default ... but it is null.. Well i don't want to stray from my original question, ALLOW NULLS are a bad thing from what i can gather .... so how do i fix this ? Any help really appreciated

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  • Is it worth using std::tr1 in production?

    - by flashnik
    I'm using MS VC 2008 and for some projects Intel C++ compiler 11.0. Is it worth using tr1 features in production? Will they stay in new standard? For example, now I use stdext::hash_map. TR1 defines std::tr1::unordered_map. But in MS implementation unordered_map is just theirs stdext::hash_map, templatized in another way.

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  • How to build Android for Samsung Galaxy Note

    - by Tr?n Ð?i
    I'd like to modify and build my own Android for my Samsung Galaxy Note I've downloaded Android 4.1.2 from http://source.android.com and Samsung open source for my Samsung Galaxy Note. After extract Samsung open source, I get 2 folders: Kernel and Platform, and 2 README text file README_Kernel.txt 1. How to Build - get Toolchain From android git server , codesourcery and etc .. - arm-eabi-4.6 - edit build_kernel.sh edit "CROSS_COMPILE" to right toolchain path(You downloaded). EX) CROSS_COMPILE= $(android platform directory you download)/android/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi- Ex) CROSS_COMPILE=/usr/local/toolchain/arm-eabi-4.6/bin/arm-eabi- // check the location of toolchain - execute Kernel script $ ./build_kernel.sh 2. Output files - Kernel : arch/arm/boot/zImage - module : drivers/*/*.ko 3. How to Clean $ make clean README_Platform.txt [Step to build] 1. Get android open source. : version info - Android 4.1 ( Download site : http://source.android.com ) 2. Copy module that you want to build - to original android open source If same module exist in android open source, you should replace it. (no overwrite) # It is possible to build all modules at once. 3. You should add module name to 'PRODUCT_PACKAGES' in 'build\target\product\core.mk' as following case. case 1) bluetooth : should add 'audio.a2dp.default' to PRODUCT_PACKAGES case 2) e2fsprog : should add 'e2fsck' to PRODUCT_PACKAGES case 3) libexifa : should add 'libexifa' to PRODUCT_PACKAGES case 4) libjpega : should add 'libjpega' to PRODUCT_PACKAGES case 5) KeyUtils : should add 'libkeyutils' to PRODUCT_PACKAGES case 6) bluetoothtest\bcm_dut : should add 'bcm_dut' to PRODUCT_PACKAGES ex.) [build\target\product\core.mk] - add all module name for case 1 ~ 6 at once PRODUCT_PACKAGES += \ e2fsck \ libexifa \ libjpega \ libkeyutils \ bcm_dut \ audio.a2dp.default 4. In case of 'bluetooth', you should add following text in 'build\target\board\generic\BoardConfig.mk' BOARD_HAVE_BLUETOOTH := true BOARD_HAVE_BLUETOOTH_BCM := true 5. excute build command ./build.sh user What I need to do after followed 2 above files

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  • How do I implement page authorizaton in ASP.NET using a SQL store instead of web.config?

    - by drachenstern
    For instance, the way we're doing it now is like thus: (in the web.config) <location path="somePath"> <system.web> <authorization> <allow roles="approvedRoles"/> <deny users="*"/> </authorization> </system.web> </location> And what I would like to do instead is to store this information in SQL somewhere so that we can manipulate the information more easily. But we want to keep the same functionality that having the information in web.config provides, just like we can use a SqlRoleProvider instead of hardcoding roles in the app. So in other words, if a user currently tries to goto "somePath" and they're not a member of "approvedRoles" then they get redirected back to default.aspx, and if they are a member of "approvedRoles" then they get the page. I want to do the same thing, but without using web.config as the authorization mechanism. So what I'm NOT asking is how do I go about defining roles, or how do I handle logging in to the database, but specifically how do I store the above information in SQL instead of web.config. Actually, I'll take "anywhere but web.config" for now. Any ideas? Is this possible using a "Provider" class? I'm just looking for pointers on what to inherit and maybe some technet documentation. In this regard my googlefoo is lacking since I don't really know where to point. Am I really only looking for AzMan? Is this location-authorization-via-SQL already defined in the default aspnetdb somewhere and I'm missing it? For that matter, has this question already been asked on SO and I've missed it? What would you google?

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  • How to create an Universal Binary for iTunes Connect Distribution?

    - by balexandre
    I created an app that was rejected because Apple say that my App was not showing the correct iPad window and it was showing the same iPhone screen but top left aligned. Running on simulator, I get my App to show exactly what it should, a big iPad View. my app as Apple referees that is showing on device: my app running the simulator (50% zoom only): my code in the Application Delegate is the one I published before - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // The default have the line below, let us comment it //MainViewController *aController = [[MainViewController alloc] initWithNibName:@"MainView" bundle:nil]; // Our main controller MainViewController *aController = nil; // Is this OS 3.2.0+ ? #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 30200 if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) // It's an iPad, let's set the MainView to our MainView-iPad aController = [[MainViewController alloc] initWithNibName:@"MainView-iPad" bundle:nil]; else // This is a 3.2.0+ but not an iPad (for future, when iPhone/iPod Touch runs with same OS than iPad) aController = [[MainViewController alloc] initWithNibName:@"MainView" bundle:nil]; #else // It's an iPhone/iPod Touch (OS < 3.2.0) aController = [[MainViewController alloc] initWithNibName:@"MainView" bundle:nil]; #endif // Let's continue our default code self.mainViewController = aController; [aController release]; mainViewController.view.frame = [UIScreen mainScreen].applicationFrame; [window addSubview:[mainViewController view]]; [window makeKeyAndVisible]; return YES; } on my target info I have iPhone/iPad My question is, how should I build the app? Use Base SDK iPhone Simulator 3.1.3 iPhone Simulator 3.2 my Active Configuration is Distribution and Active Architecture is arm6 Can anyone that already published app into iTunes Connect explain me the settings? P.S. I followed the Developer Guideline on Building and Installing your Development Application that is found on Creating and Downloading Development Provisioning Profiles but does not say anything regarding this, as I did exactly and the app was rejected.

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  • are deleted entries counted in the load factor of a hash table using open addressing

    - by Dr. Monkey
    When calculating the load factor of a hashtable with an open-addressing array implementation I am using: numberOfKeysInArray/sizeOfArray however it occurred to me that since deleted entries must be marked as such (to distinguish them from empty spaces), it might make sense to include these in the number of keys. My thinking is that as far as estimating the average number of probes to find an entry, deleted entries should count towards the load factor, but as far as inserting a new key they should not. Which is the proper calculation: including deleted keys or not?

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  • PyQt4: Hide widget and resize window

    - by masterLoki
    Hi everyone: I'm working with several widgets but the solution just won't come out. What I have is a series of buttons in series of QHBoxLayouts. Some buttons are hidden by default, but they will appear when needed. To solve space issues, all buttons have a minimum and maximum size so they always look well packed. Also I have a QTextEdit, visible by default, which is in a QVBoxLayout with the QHBoxLayout that hold the buttons So the problem is this: When I hide the QTextEdit and show the other buttons, the window won't resize. After searching I found that using self.ui.layout().setSizeConstraint(QtGui.QLayout.SetFixedSize) will do the trick, but the problem is that it takes the maximum size from all widgets, therefore I end a huge window. Doing self.ui.layout().setSizeConstraint(QtGui.QLayout.SetMinAndMaxSize) won't resize the window I already tried using self.ui.resize(0,0), and when doing a self.ui.layout().update() I got False (which I find odd, http://doc.trolltech.com/4.6/qlayout.html#activate), and also tried to override sizeHint() but it keeps using the max size for all widgets. Is there a way to resize the window and while taking care of the min and max size of a widget? Thanks in advance

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  • "Hello World" in less than 20 bytes

    - by xelurg
    We have had an interesting competition once, where everyone would write their implementation of hello world program. One requirement was that is should be less than 20 bytes in compiled form. the winner would be the one whose version is the smallest... What would be your solution? :) Platform: 32bit, x86 OS: DOS, Win, GNU/Linux, *BSD Language: Asm, C, or anything else that compiles into binary executable (i.e. no bash scripts and stuff ;)

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  • Silverlight RIA Services - how to do Windows Authentication?

    - by Gustavo Cavalcanti
    I am building my first Silverlight 3 + RI Services application and need some help. It will be deployed in an controlled corporate intranet, 100% windows clients. I have started from the Silverlight Business Application template. These are my requirements: Upon launch the application needs to recognize the currently logged-in user. The application needs to have access to other properties of the user in AD, such as email, full name, and group membership. Group membership is used to grand certain features in the application. A "login as a different user" link is to be always available - Some machines are available throughout the enterprise, logged-in as a certain generic user (verified by the absence of certain membership groups). In this case one can enter credentials and log in (impersonate) to the application as a user different from the one already logged-into the machine. This user is to be used in service calls I have modified the following in the default Business Application template: App.xaml: appsvc:WindowsAuthentication instead of the default FormsAuthentication Web.config: authentication mode="Windows" With these modifications I resolve requirement #1 (get the currently logged-in user). But when I examine RiaContext.Current.User, I don't have access to other properties from AD, such as group memberships. How can I achieve my other requirements? Thanks for your help.

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  • Does it make sense to resize an Hash Table down? And When?

    - by Nazgulled
    Hi, My Hash Table implementation has a function to resize the table when the load reaches about 70%. My Hash Table is implemented with separate chaining for collisions. Does it make sense that I should resize the hash table down at any point or should I just leave it like it is? Otherwise, if I increase the size (by almost double, actually I follow this: http://planetmath.org/encyclopedia/GoodHashTablePrimes.html) when the load is 70%, should I resize it down when the load gets 30% or below?

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  • Did anyone give these smart pointers (auto_any, scoped_any, shared_any) a test drive?

    - by Johann Gerell
    I'm investigating smart pointers with "shared" functionality for Windows CE and Mobile, where the VS 2008 tr1 std::shared_ptr cannot be used (due to linkage to a v.9 dll not present on CE, obviously, if I understand it correctly). There's a semi-old MSDN Magazine article with sources from a Microsoftie (Eric Niebler): Achieve More Reliable Resource Management with Our Custom C++ Classes. The reasoning, design and implementation of his shared_any looks solid, but I'm wondering if anyone ever actually tested the lot on any platform (not necessarily WinCe/WM)?

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  • How to disable auto-generated WCF configuration

    - by user351025
    Every time my program runs vs adds the default configuration to my app.config file. At that run it works fine, but at the next run it actually tries to read the config. The problem is that the default configuration has errors, it adds the attribute "Address", but attritbutes are not allowed to have capitals so it throws an exception. This means I have to remove the bad section every run! I've tried to configure the .config but it gives errors. Here is the code that I use to host the server: private static System.Threading.AutoResetEvent stopFlag = new System.Threading.AutoResetEvent(false); ServiceHost host = new ServiceHost(typeof(Service), new Uri("http://localhost:8000")); host.AddServiceEndpoint(typeof(IService), new BasicHttpBinding(), "ChessServer"); host.Open(); stopFlag.WaitOne(); host.Close(); Here is the client code that calls the server: ChannelFactory<IChessServer> scf; scf = new ChannelFactory<IService> (new BasicHttpBinding(), "http://localhost:8000"); IService service = scf.CreateChannel(); Thanks for any help.

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  • window.location.href not working in Safari when using onkeypress

    - by insanepaul
    I'm using an asp textbox and a search button. In Safari if I click the search button i get redirected to the search results page using javascript window.location.href. But strangely the same javascript will not redirect to the page if I press return in the textbox. Using the alert function I can see that window.location.href has the the correct url and the location bar at the top changes from the search page(default.aspx) to the search results url however when I click OK to the alert box the url at the top reverts back to the default.aspx page. It works on ie7/8/firefox/chrome but not safari. Here is my javascript,cs and aspx code: function submitSearchOnEnter(e) { var CodeForEnter = 13; var codeEnteredByUser; if (!e) var e = window.event; if (e.keyCode) codeEnteredByUser = e.keyCode; else if (e.which) codeEnteredByUser = e.which; if (codeEnteredByUser == CodeForEnter) RedirectToSearchPage(); } function RedirectToSearchPage() { var searchText = $get('<%=txtHeaderSearch.ClientID%>').value if (searchText.length) { window.location.href = "Search.aspx?searchString=" + searchText; } } protected void Page_Load(object sender, EventArgs e) { txtHeaderSearch.Attributes.Add("onkeypress", "submitSearchOnEnter(event)"); } <asp:Panel ID="pnlSearch" runat="server" DefaultButton="lnkSearch"> <asp:TextBox ID="txtHeaderSearch" runat="server" CssClass="searchBox"></asp:TextBox> <asp:LinkButton ID="lnkSearch" OnClientClick="RedirectToSearchPage(); return false;" CausesValidation="false" runat="server" CssClass="searchButton"> SEARCH </asp:LinkButton> </asp:Panel> I've tried return false; which doesn't allow me to enter any characters in the search box. I've spent ages online trying to find a solution. Maybe it has something to do with setTimeout or setTimeInterval but it didn't work unless i did it wrong.

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  • Perl vs Python but with more style than normally

    - by user350571
    I'm learning perl and everytime I search for perl stuff in the internet I get some random page with people saying that perl should die because code written in it looks like a lesson in steganography. Then they say that python is clean and stuff like that. Now, I know that those comparisons are always stupid and made by fellows that feel that languages are a extension of their boring personality so, let me ask instead: can you give me the implementation of a widely known algorithm to deal with a data structure like red-black trees in both languages so I can compare?

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  • computing hash values, integral types versus struct/class

    - by aaa
    hello I would like to know if there is a difference in speed between computing hash value (for example std::map key) of primitive integral type, such as int64_t and pod type, for example struct { int16_t v[4]; };. I know this is going to implementation specific, so my question ultimately pertains to gnu standard library. Thanks

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  • registration 0.8 alpha activation problem

    - by craphunter
    Got the following error: Exception Type: TypeError at /accounts/account/activate/success/ Exception Value: activate() takes at least 2 non-keyword arguments (1 given) My view: def activate(request, backend, template_name='registration/activation_complete.html', success_url=None, extra_context=None, **kwargs): backend = get_backend(backend) account = backend.activate(request, **kwargs) if account: if success_url is None: to, args, kwargs = backend.post_activation_redirect(request, account) return redirect(to, *args, **kwargs) else: return redirect(success_url) if extra_context is None: extra_context = {} context = RequestContext(request) for key, value in extra_context.items(): context[key] = callable(value) and value() or value return render_to_response(template_name, kwargs, context_instance=context) My url: urlpatterns = patterns('', url(r'^activate/complete/$', direct_to_template, { 'template': 'registration/activation_complete.html' }, name='registration_activation_complete'), # Activation keys get matched by \w+ instead of the more specific # [a-fA-F0-9]{40} because a bad activation key should still get to the view; # that way it can return a sensible "invalid key" message instead of a # confusing 404. url(r'^activate/(?P<activation_key>\w+)/$', activate, { 'backend': 'registration.backends.default.DefaultBackend' }, name='registration_activate'), url(r'^register/$', register, { 'backend': 'registration.backends.default.DefaultBackend' }, name='registration_register'), url(r'^register/complete/$', direct_to_template, { 'template': 'registration/registration_complete.html' }, name='registration_complete'), url(r'^register/closed/$', direct_to_template, { 'template': 'registration/registration_closed.html' }, name='registration_disallowed'), (r'', include('registration.auth_urls')), url(r'^account/activate/(?P<activation_key>\w+)/$', 'registration.views.activate', {'success_url': 'account/activate/success/'}, name='registration_activate2'), url(r'^account/activate/success/$', direct_to_template, {'template': 'registration/activation_complete.html'}, name='registration_activation_complete'), ) What do I do wrong? Thanks!

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  • How to change type of information for a Title column in SharePoint MOSS 2007 List?

    - by Ruba
    I created a calendar in SharePoint MOSS 2007 that is connected to my Outlook. I added a custom column “Person” to this list and the type of information in this column is: Person or Group. In SharePoint I can hide Title column and in Calendar View show this Person field as Month View Title. So I can see on the calendar who is working that day. Problem is in Outlook. It seems like Outlook doesn’t know a thing about custom fields. In Outlook I can see only Title and few other fields. I could rename Title field to Person, but I can’t change type of information that it contains. By default it is text field and no way to change it to Person or Group. If I could change those “default” column types, then I think my problem would be solved. I know it is possible. I created a custom list, but this list has also those “sticky” Title, Created By and Modified By columns that can’t be changed or removed. Maybe I have to create a custom list with some other program or code? Please help! Thanks in advance!

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  • Equivalent of libwww-perl in .NET or Java

    - by voidvector
    I have written a crawler in Perl awhile back and it was super simple giving the high-level capability of libwww-perl. It is so straight forward in fact, it can take the raw HTML response of one request, and create the next HTTP request for you from the FORMs on that page (as in it will parse the HTML for you). Does anyone know any library like this on .NET or Java? Selenium is out of question because it requires the browser to be open, which we cannot accommodate in our implementation)

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  • Internationalization & Localization issue

    - by Ahmad
    Hi all, My application supports internationalization and localization, each user can choose his preference language and the application will reflect it perfectly. the issue is when the first user selects English and the second one selects French the resource bundle for the first user will read from the French resource after refreshing his page. I am using the following code to change between the two languages: public void changeToEnglish() { FacesContext context = FacesContext.getCurrentInstance(); Locale currentLocale = context.getViewRoot().getLocale(); String locale = "en_US"; Locale newLocale = new Locale(locale); if(!currentLocale.equals(newLocale)) context.getViewRoot().setLocale(newLocale); } I have the following in my faces_config.xml: <locale-config> <default-locale>en</default-locale> <supported-locale>fr</supported-locale> </locale-config> the application respond very well to changing languages but I think when setting the locale from the FacesContext it reflects all the users locales. Please help me on this....

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  • P3P - compact policy and legal stuff

    - by Matty F
    Is it legally OK to have only a P3P compact policy (allowing cookies in IE6+)? The P3P XML will also be present with company details and a link to the privacy policy, but nothing more. What are the legal implications of P3P and an incorrect implementation, especially in the UK?

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